【摘要】 采用界面生长法,以醋酸铜为母体,抗坏血酸(Vc)为还原剂,吐温-85为修饰剂,正丁醇为生长剂,合成了粒径约15.5nm的油溶性球形纳米铜粉;通过X-射线衍射(XRD)和透射电子显微镜(TEM)对纳米铜粉进行了表征;将其作为润滑油添加剂分散于SF15W/40汽油机油中制得纳米润滑油;通过高浓度激光粒度仪考察了纳米润滑油的分散稳定性;通过UMT-Ⅱ摩擦磨损实验机考察了纳米润滑油的摩擦学性能;采用扫描电子显微镜(SEM)分析了磨损表面形貌。结果表明:纳米铜粉在润滑油中具有优异的分散稳定性;纳米铜粉显著改善了SF15W/40汽油机油的润滑性能,其最佳添加量为0.8%。分析认为纳米铜在摩擦表面的划痕和犁沟处沉积并铺展成膜,从而改善了摩擦磨损性能。更多还原

【Abstract】 15.5 nm diameter oil-soluble sphere nano-copper was prepared by oil-water interface growth method,using copper acetate tetrahydrate as precursor,ascorbic acid as reductant,polyethylene sorbitan monooleate (Tween-85) as modifier,and 1-butanol as growth agent.The as-prepared copper nanopieces were characterized by XRD,and TEM.The dispersion stabilization and tribological behavior of the oil-soluble copper nanoparticles as SF15W/40 lubricating oil additive were investigated on high-concentration laser granularity scatter analyzer and ball-on-disk UMT-Ⅱ tribometer.The worn surface morphology was analyzed by means of SEM.Experimental results show that the oil-soluble nano-Cu is wetting effect in SF15W/40 lubricating oil and keeps long-term finely dispersed,and SF15W/40 lubricating oil’s tribological property is markedly enhanced with the oil-soluble nano-copper as its additive.The synthetic additive at 0.8% has the lowest friction coefficient and wear loss.The oil-soluble Cu nanoparticles agglomerate discontinuous deposited,extrude,melt,spread,and form a film in micro-defects on the worn surfaces,then improve the friction-reducing ability and antiwear ability of SF15W/40 lubricating oil.更多还原